are you sure the option is checked? what size maps are you running? How far have you played?? I find those events on the larger maps do not start till nearly every planet on the map is filled.. Perhaps around the time about half the total techs are researched? maybe 5-6 yearly meetings have happened..
If you restarted games a few times, you might not of gotten one. I know sometimes i will play for 8+ hours on a single game and not have an event happen.. though the map size i play, that is maybe 1/3 of the way through a single game
